Engine/Power - EJ20T (pre-2006 WRX and JDM) There is replacement for displacement, it is forced induction - OEM 2.0 liter turbo engines in the USDM WRX. 90-94 Legacy Turbo EJ22 turbo engines can also be discussed here.

cat less vs. cat

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Old 12-12-2002, 04:49 PM
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You may get a cat related CE light from a downpipe with a hiflow cat as well.

I would guess the power difference is roughly 5hp from a catless downpipe to a quality hi-flow cat in the downpipe (but I haven't dyno'd any to be sure).

For me I went with the cat in the downpipe as the first and third cats were being eliminated in my car anyway and I wanted to have at least one for random visual inspections and so I don't feel like I am destroying the environment with my emissions

Regards,

Aaron
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